ESP-WROOM-02 vs ESP32-MINI-1
ESP-WROOM-02
WROOM · ESP8266 · Active
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ESP32-MINI-1
MINI · ESP32 · Active
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Every figure here is checked against Espressif’s official datasheets. We’ve taken every care to keep it accurate — but datasheets are dense and mistakes happen, so if something looks off, please report it.
Which should you choose?
These run different SoCs (ESP8266 vs ESP32), so they differ in CPU, wireless and peripherals — not just packaging.
Choose ESP-WROOM-02 if you need
no standout advantage over ESP32-MINI-1 — it trades on the points opposite.
Choose ESP32-MINI-1 if you need
- Bluetooth LE
- 2 CPU cores vs 1 — more headroom for RTOS / parallel work
- faster CPU (240 MHz, Xtensa LX6)
- larger flash option (up to 4 MB) for bigger firmware and OTA
- Ethernet MAC for wired networking (add an external PHY)
Size, to scale
- ESP-WROOM-02 — 18×20 mm
- ESP32-MINI-1 — 13.2×19 mm
Spec differences at a glance
- CPU: ESP-WROOM-02 Xtensa L106, 1-core · ESP32-MINI-1 Xtensa LX6, 2-core
- Max clock: ESP-WROOM-02 160 MHz · ESP32-MINI-1 240 MHz
- SRAM: ESP-WROOM-02 — KB · ESP32-MINI-1 520 KB
- ROM: ESP-WROOM-02 — KB · ESP32-MINI-1 448 KB
- Flash options: ESP-WROOM-02 2 MB · ESP32-MINI-1 4 MB
- Co-processor: ESP-WROOM-02 none · ESP32-MINI-1 ULP-FSM
- Bluetooth: ESP-WROOM-02 — · ESP32-MINI-1 BT Classic + BLE
- Usable GPIO: ESP-WROOM-02 11 · ESP32-MINI-1 28
- ADC: ESP-WROOM-02 1× 10-bit · ESP32-MINI-1 18× 12-bit
- UART / SPI / I²C / I²S: ESP-WROOM-02 2 / 1 / 1 / 1 · ESP32-MINI-1 3 / 2 / 2 / 2
- TWAI (CAN): ESP-WROOM-02 No · ESP32-MINI-1 Yes
- Ethernet MAC: ESP-WROOM-02 No · ESP32-MINI-1 Yes
- Touch: ESP-WROOM-02 0 · ESP32-MINI-1 10
- Operating voltage: ESP-WROOM-02 2.7-3.6 V · ESP32-MINI-1 3.0-3.6 V
- Deep sleep: ESP-WROOM-02 20 µA · ESP32-MINI-1 10 µA
- Dimensions: ESP-WROOM-02 18 × 20 × 2.8 mm · ESP32-MINI-1 13.2 × 19 × 2.4 mm
- Pin count: ESP-WROOM-02 18 · ESP32-MINI-1 34
- Secure boot: ESP-WROOM-02 No · ESP32-MINI-1 Yes
- Flash encryption: ESP-WROOM-02 No · ESP32-MINI-1 Yes
- Crypto: ESP-WROOM-02 — · ESP32-MINI-1 AES, SHA, RSA, RNG
Compute & memory
⚑ flag an error| ESP-WROOM-02 | ESP32-MINI-1 | |
|---|---|---|
| CPU≠ | Xtensa L106, 1-core | Xtensa LX6, 2-core |
| Max clock≠ | 160 MHz | 240 MHz |
| SRAM≠ | — KB | 520 KB |
| ROM≠ | — KB | 448 KB |
| Flash options≠ | 2 MB | 4 MB |
| PSRAM | None | None |
| Co-processor≠ | none | ULP-FSM |
Wireless
⚑ flag an error| ESP-WROOM-02 | ESP32-MINI-1 | |
|---|---|---|
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Wi-Fi bands | 2.4GHz | 2.4GHz |
| Bluetooth≠ | — | BT Classic + BLE |
| 802.15.4 (Thread/Zigbee) | No | No |
| Antenna | PCB | PCB |
Peripherals & I/O
⚑ flag an error| ESP-WROOM-02 | ESP32-MINI-1 | |
|---|---|---|
| Usable GPIO≠ | 11 | 28 |
| ADC≠ | 1× 10-bit | 18× 12-bit |
| USB | USB-Serial(external) | USB-Serial(external) |
| UART / SPI / I²C / I²S≠ | 2 / 1 / 1 / 1 | 3 / 2 / 2 / 2 |
| TWAI (CAN)≠ | No | Yes |
| SD/MMC | Yes | Yes |
| Ethernet MAC≠ | No | Yes |
| Touch≠ | 0 | 10 |
Power
⚑ flag an error| ESP-WROOM-02 | ESP32-MINI-1 | |
|---|---|---|
| Operating voltage≠ | 2.7-3.6 V | 3.0-3.6 V |
| Deep sleep≠ | 20 µA | 10 µA |
Physical
⚑ flag an error| ESP-WROOM-02 | ESP32-MINI-1 | |
|---|---|---|
| Dimensions≠ | 18 × 20 × 2.8 mm | 13.2 × 19 × 2.4 mm |
| Pin count≠ | 18 | 34 |
| Temp range | -40 to 85 °C | -40 to 85 °C |
| Mounting | SMD castellated | SMD castellated |
| Lifecycle | Active | Active |
Security
⚑ flag an error| ESP-WROOM-02 | ESP32-MINI-1 | |
|---|---|---|
| Secure boot≠ | No | Yes |
| Flash encryption≠ | No | Yes |
| Crypto≠ | — | AES, SHA, RSA, RNG |
| Digital signature | No | No |
| TRNG | Yes | Yes |